Oxygen solid solution titanium material sintered compact and method for producing same
a technology of titanium and solid solution, which is applied in the direction of transportation and packaging, metal-working apparatus, etc., can solve the problems of high material cost of titanium, insufficient ductility, and limited use of titanium
Active Publication Date: 2022-01-04
HI-LEX CORPORATION
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Benefits of technology
The invention can help create a strong titanium compact by strengthening the metal with oxygen atoms from the metal oxide and by strengthening it using metal atoms that are dissociated from the metal oxide. This can be done through solid solution strengthening, deposition strengthening, or dispersion strengthening.
Problems solved by technology
However, as compared with a steel material or an aluminum alloy, titanium has a high material cost, so that an object of use is limited.
In particular, though having a high tensile strength exceeding 1000 MPa, a titanium alloy raises a problem of having an insufficient ductility (elongation after fracture) and also having a poor plastic formability at an ordinary temperature or in a low-temperature region.
On the other hand, pure titanium raises a problem of low tensile strength of about 400 to 600 MPa, though having a high percentage elongation after fracture exceeding 25% at an ordinary temperature and being excellent in plastic formability in a low-temperature region.
Method used
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[0056][Binary Phase Diagram of Ti—O]
[0057]FIG. 1 shows a binary phase diagram of titanium and oxygen. As will be clear from FIG. 1, an α-Ti crystal can dissolve oxygen as a solute of solid solution up to 33 atom % at the maximum. The reason why such a large amount of oxygen can be dissolved as a solute of solid solution is that the α-Ti crystal has a hexagonal close-packed structure (hcp). Titanium is the only element that can dissolve a large amount of oxygen as a solute of solid solution, and this characteristic feature cannot be seen in the other metals.
[0058]However, when a titanium material is fabricated by the melting method, it is not possible to dissolve a large amount of oxygen as a solute of solid solution. This is because, in a liquid phase state, a crystal lattice is not formed, and titanium takes up oxygen only when titanium is brought into a solid phase state to form a crystal lattice having the hexagonal close-packed structure.
[0059][Standard Free Energy of Formation ...
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Abstract
An oxygen solid solution titanium sintered compact includes a matrix made of a titanium component having an α-phase, oxygen atoms dissolved as a solute of solid solution in a crystal lattice of the titanium component, and metal atoms dissolved as a solute of solid solution in the crystal lattice of the titanium component.
Description
TECHNICAL FIELD[0001]The present invention relates to a high-strength titanium material, and more particularly to an oxygen solid solution titanium sintered compact in which oxygen is dissolved as a solute of solid solution, as well as to a method for producing the same.BACKGROUND ART[0002]Titanium is a light-weight material having a low specific gravity of about ½ of that of steel and has excellent characteristics in corrosion resistance and strength, so that titanium is used in a component of an aircraft, a railway vehicle, a two-wheel vehicle, an automobile, or the like in which weight reduction is strongly demanded, or in a household electric appliance or an architectural member. Also, from the viewpoint of excellent corrosion resistance, titanium is also used as a material for medical use.[0003]However, as compared with a steel material or an aluminum alloy, titanium has a high material cost, so that an object of use is limited. In particular, though having a high tensile stren...
Claims
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IPC IPC(8): B22F3/10C22C14/00C22C1/04C22C32/00C22C1/05B22F1/00B22F3/14B22F3/24B22F3/105B22F3/20B22F1/05
CPCB22F3/1039B22F1/0011C22C1/045C22C1/05C22C14/00C22C32/001C22C32/0031B22F3/105B22F3/1007B22F3/14B22F3/20B22F2003/1051B22F2003/248B22F2201/10B22F2201/11B22F2301/205B22F2304/10B22F2998/10B22F2999/00B22F1/05B22F3/02B22F1/102
Inventor KONDOH, KATSUYOSHI
Owner HI-LEX CORPORATION